Moscow: Russian foreign minister Sergei Lavrov compared US president Donald Trump and North Korean leader Kim Jong-un to a kindergarten children.

The North Korean leader earlier tagged Trump "mentally disturbed" and a "dotard" after Trump threatened to wipe out his country.

Trump acted in response with a tweet calling Kim Jong-un "a madman" who "will be tested like never before!"

Lavrov said a pause was required, "to calm down the hotheads", BBC reported on Friday.

"Yes, it's objectionable to mutely watch North Korea's nuclear military adventures but it is also unacceptable to give a free rein to war on the Korean Peninsula," he said.

He called for a political process, which he said was a key part of the United Nations Security Council process.

"Together with China we'll carry on to strive for a sensible approach and not an emotional one like when children in a kindergarten start fighting and no-one can end them," he said.

The North Korean leader had attacked Donald Trump days after his speech at the United Nations, in which the US president said he would "completely destroy" North Korea if the US was forced to protect itself or its allies.

He also made fun of Kim Jong-un with a disparaging nickname, saying: "Rocket man is on a suicide mission."

But the North Korean leader said remarks by the "deranged" US president swayed him he is right to expand weapons for North Korea.

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